.tag {
  position: absolute;
  top: 2.5%;
  left: 2.5%;
  color: white;
  z-index: 10;
  padding: 10px 10px 5px 10px;
  border-radius: 100px;
  transition: background-color 0.33s;
}

.tag:hover {
  background-color: rgba(255, 255, 255, 0.5);
}

.container {
  color: white;
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-flow: column;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 9;
  padding: 7em 5em 5em 10em;
  opacity: 0;
  animation: showContainer 1s forwards;
  transition: background-color 0.33s;
}

.singleButton {
  padding: 0.5em 0 0.5em 0;
}

.button_text {
  font-family: "思源宋体", serif;
  font-size: 250%;
  letter-spacing: 0.07em;
  transition: text-shadow 0.33s;
}

.button_text:hover {
  text-shadow: 0 0 15px rgba(255, 255, 255, 1);
}

@keyframes showContainer {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
